Zinc-smelting furnace



Apr. 24, 1923. I 1,452,934

B. Rem-:R

ZINC suEL'rING FURNACE Filed Feb. 5, 1920 To all 'whom-.it 'may'lconcern:

PaanfedApf. 24, I,1923.l

U-NiTEDjsrATl-:s'-

PATENT l OFFICE AND AxTIEsELsxarET zINx, Bom or y:Humains-Run, AsKIMSTATION, NORWAY.

. ZINC-SNELTING FURNAOEQ application inea reb'ruarys, 1920.- .serial No.35ans.

.Be a known that r, BJRN'ItEiSER, a sub: ject of the King vof Norway,residing `at Kykkelsrud,Askim Station, Norway, have invented'azcertaiiinew and Auseful Improvements vin a Zinc-Smelting'Furnace; and I do i liherebydeclare ftheffollowing tobe a' full,

clear, and exact description'of the invention,

such as will enable Others skilledin the-art to which it appertains `tomake'and use the same, reference being hadto the'accompanyfing drawings,'and to' letters or figures of reference marked thereon, which formapart 'of this specification.

. By thep'roduction .offzinc electric fur?" vhaces. it hasbeenound to be'of importance to expose the charge to a preliminary drying landvheating treatment before' feeding it into j the reductionchamber, andthis drying .and

2o gcarbon monoxide gases-developed in .the fur- I heating preferablytakes place by means of` The present inventionhasffor itsfobjefuat"r anelectriczinc smelting furnace' ofthe kind through carbon electrodesdipping into the"- where the' electric current is supplied slag bath,said furnacebeing provided above `veloped during the smelting process, I

In they drawings,` Figure l is va vertical section on line 1 1 of Fig;2, of .af furnace constructed inV accordance with my inventrodesf.project through all the fsu'perposed tion. Fio'ure2 is asimilar sectionon line Qnf-Q of vlfig. 1,' the electrodes being-shown in l-elevation.The furnace' illustrated comprises three s'uperposed chambers, of whichthettop chamber is `-a preliminary. drying chamber without 4separateheating means.l

The next chamberisa reheating and glowingcha'mbe'r,` andthe Ottomcompartment is a reduction chamber consisting of ,a closed electricfurnace.

Each compartment. may be divided in two.

or more-superposed chambers, and the-elecychambers from the top intolthe bottonror rrductioii vchamber.

The charge is first placedon anopendrying plate l, from which it is fedthrough a A central opening 2 into a closed drying chamber 3 heated fromthe lower'compartments Aand by means of combustion gases from the `flamechamber.

means 'of electrodes 7.

l l :ceeds most'q'uickly. the reduction ,chamber with va heating anddryingfurna'ce, which is heated b'y combustion' of. gas, such as carbon"monoxide dev From this drying chamber the charge lis a flame furnaceand is supplied with carbon' .monoxide gas from the condensors or fromheated red hot and is vfinally 'conducted fed through openings 3 intothe glowing or Aheatmgchamber 4, Which'is constructed as -In thisheating chamber` the c arge isthrough suitable opening LLin the bottomvof the iame chamber 'into the reaction chamber 5 itself, which isvheated by electricv current supplied' in the usual manner by In orderthat the electrode shall' notgbe .exposed vdirectly to the hottemperature of the iame chamber,.it is. surrounded 'by al sleeve or'tube8.

For the feeding of the charge `from the l provided .for the electrodesin the roofv o at the same time the charge is introducedjust -at theplace where the smeltin'gfpro`v .Haine chamber tothe electric furnace itis preferred" to utilize the openings' t l he reduc- .'tion chamber,said openings being enlarged.

The tightening about the electrode convement-ly may take place by meansof loose chamotte plates or the like, covered by a layer ofa pulverizedmaterial 9 preferably f Apulverized charge or a pulverized ingredient ofthe charge, The .feeding of the charge vjeyor-'screws 1,0.4 .Chi-Insee.11A ,furnace'of the character described comprising essentially threesuperpose'd communicating chambers, the uppermost chamvber..constitutinga .preliminary drying chambei?, the intermediate chamber constituting apreheating chamber., and the bottom chamv jber constituting a reductionchamber, said drying chamber being constructed 'to .be heated bythecombustion gases from the intermediate chamber, means. for heatingthelast;

named chamber, and anjelectrode extending down through the two uppermostchambers intothe bottom chamber for the purpose of electrically heatingthe latter.,

2. A furnace of the character described bers,.the uppermost chamberconstituting a ioo' los

comprising superposed communicating cham preliminary 'drying chamberftheintermediate chamber constituting a preheating chamber,jand the bottomchamberconstituting a reduction chamber, said drying chamberbeing'constructed to beheated by the combustion `ases from theintermediate chamber,

said rying and preheatingchambers each comprising a plurality ofsuperposed compartments, means for heating lthe intermediate chamber,and an electrode extending down through the two 'uppermost chambers intothe bottom chamber for the purpose of electrically heating the latter..

3. A furnace aof the character' described comprising essentially threesuperposed communicating chambers, the uppermost chambervconstituting apreliminary dryingV c zha'm'ber,` the intermediate chamberconstituti'nga 'preheating chamber, andthe bottom chamber constituting areduction chamber, said drying chamber being constructed' to be heatedby the, combustion gases from the intermediate chamber, means forheating the last-namedichamber, anelectrode ex# tending down through'thetwo uppermost chambers into, the'bottom chamber,` and a sleeve enclosingthe electrode for protecting the same against'the influence of theflame. 4. A furnace of the character described comprising threesuperposed communicating chambers, the .uppermost chamber constituting-apreliminary drying chamber, the inter# I mediate chamber constituting apreheating chamber. and the bottom chamberconstituting a reductionchamber, said drying chamber being constructed to be heated bythecombustion .gases from the intermediatev chamber, means' for heatingthe last-named chamber, and an electrode extending down through thetwoiuppermost chambers into the bottom chamber, the roof of thebottomchamber having an opening surrounding the" 1 electrode which openingserves as a feeding` opening for the charge into the reduction" chamber.

5. A furnace" of the character' described comprising three superposedcommunicating chambers, the uppermost chamber constituting'a preliminarydrying chamber, the intermediate chamber constituting a preheatingchamber, and the bottom chamber constituting a reduction chamber, saiddrying chamber being constructed to be heated by lthe combustion gasesfrom the intermediatel mediate chamber` constituting a preheating`chambexx-'and4 the bottom chamber constituting'a-reduction chamber, saiddrying chamber being constructed 'to be-heated'by the combustion gases-rom Y the intermediate chamber, means for heating the last-namedchamber, an electrode extending down through the two uppermost chambersinto the bottoni chamber,` and cooled conveyor screws located. on -thefloorsof the several chambers for feeding the charge succesively throughthe several chambers as set orth.-

- In testimony that I claim the foregoing as i my finvention, I havesigned my name lin' presence of two subscribing Witnesses.

'y BJRN RZEDER. Witnesses: l -I NAfrH. A. HEDENCHOU,

- ROBERT H. FRAZIER.

